Permutation-lock



D. J. DAVIS. PEBMUTATION LOCK. APPLICATION FILED APR. 12. 19!].

Patented Jan. 27, 1920.

nvrewro R I VII Jail/Y 24 V16 UNITED STATE$ PATENT OFFICE.

DAVID JOHN DAVIS, OF I-LAVEBFOBDWEST, WALES.

PERIVEUTATION-LOCK.

Application filed April 12, 1917.

To all whom it may concern:

Be it known that 1, DAVID JOHN DAVIS, a subject of His Majesty the King of England, and resident of Haverfordwest, South Wales, Kingdom of England, have invented certain new and useful Improvements in and Relating to Permutation-Locks, of which the following is a specification.

This invention relates to improvements in permutation locks, and has for its primary object to provide an improved device of this character particularly adapted for fastening and securing boxes, traveling trunks, attache cases, letter cases, handbags, and the like.

Another object of the invention is to provide acode or permutation lock in which the parts are few in number, are of simple, durable and improved construction, and are eflicient in operation.

The invention will now 'be described with reference to the drawings forming a part of this specification, in which drawings Figure 1 is a front elevation of a suitable construction of the complete permutation lock;

Fig. 2 is a side elevation of the permutation lock;

Fig. 3 shows the hasp in side elevation and a cross sectional elevation of the lock proper on the line 83 of Fig. 1;

Fig. 4c is a front elevation of the look without the hasp;

Fig. 5 shows cross sections of the adjustable disks and the front and back plates detached from one another; and

Fig. 6 illustrates separate elevations of the three adjustable disks in the correlated positions they occupy when the hasp is free to be inserted or withdrawn.

The lock or fastening device illustrated comprises three flat circular locking disks a, 7) and 0 each adapted to rotate independently of the others, and each provided with a notch or keyway d. The disk at is formed with a sleeve 6 upon which the disk 0 is mounted, and the disk In with a sleeve f on which the disk 0 is mounted, while the disk 0 has no projecting formation on its back face, and each disk is provided with a pointer or projection on its periphery for a purpose hereinafter referred to.

The three disks are arranged between a front flat circular rigid or non-rotary plate It and a back rigid or non-rotary plate 2',

Specification of Letters Patent.

- upstanding portion 79 Patented Jan. 27, 1920.

Serial No. 161,624.

and are mounted on a boss j, formed on the rear face of said front plate. The boss serves as a pivot on which disks rotate di rectly or indirectly and on which they are held in position in their respective order. The boss 7' is formed with a shank 7a which after the locking disks have been placed together in their respective positions, is passed through a hole Z provided in the back plate and hammered over to rigidly secure the front plate to said back plate. Each of the front and back plates is formed with a slot or kevway m and the boss j is cut away at n to allow for the free passage of a lock ing pin having a rcarwardly extending portion 0 and an upturned portion 39, said looking pin being provided on ahasp q pivoted at r to a plate 8. The plates h and 2' constitute in efiect a case. The edges of the locking disks are exposed and the proiections 9 extending beyond the edge of the front plate It serve as operating means to be engaged when rotating the disks to bring their keyways into or out of alinement.

It is to be understood that suitable letters, marks, or other indicia well known in the art of permutation locks, will be provided to coeperate with the pointers g of the rotatable locking disks to enable the alining of the keyways when it is required to pass the locking pin 0-72 therethrough. The indicia may appear on the case in any desired relative position.

The back plate 2' may be of any shape and size, and is secured in suitable manner to a box case or the like, represented by dotted lines at u, Figs. 1. 2, and 3, such as by screws, nails, or the like, while the plate 8 is similarly secured to the lid o of the box. case or the like.

The action of the look or fastening device is as follows :The lock is unfastened or opened when all of the notches (Z and the slots are collinear thus allowing the looking pin 0. p to be pressed in or withdrawn easily. To lock or fasten the device the hasp a is shut down and the locking Din 0, y) thereon inserted through the notches in the disks and seated within the slots in the plates. If new, the disks are rotated in either direction, to move their notches out of alinement with the slots m, the pin 0, p is firmly locked in position with its disposed behind the slot m of the back withdrawn until the disks and within the plate 2', and cannot be vletter, number or index of the case. combmatlon of such letters, numbers, or

combination of its own. .may be further complicated by the add1t1on of one or more locking dlsks, only three other marks serves as the secret key code vof that one and particular lock, and it is obvious that each lock will have a secret The combmation being shown in the drawings.

It will be seen by referrlng to the drawings that the locking pin 0, p of the hasp passes through the disks and plates and the notches and slots therein in a plane dlsposed to one side of the axis of the CllSkS, and when in 1ts fastening or closed posltion and when the disks are in locking position,

is located and extends through and within the disks and plates, Fig. 3.

What I claim is A look comprising a back plate provided with attaching means and having a central opening, said back plate being also provided with a slot at one side of the opening between the same and the periphery of the back plate, a front plate of circular form having a slot in register with the slot of the back plate and provided with a central boss front and back plates and provided with slots located within the peripheries of the lock disks and adapted to register with one another and with the slots of the front and back plates, said disks being exposed at the periphery of the front plate for manipulation and a coactingl1asp member having a substantially hook-shaped portion movable through the said slots when the same are in register and lying in said groove and the slot of the back plate when in locked position.

In testimony whereof I have hereunto signed my name.

DAVID JOHN DAVIS. 

